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Google圖書搜尋
Size-class Distribution in Old-growth Northern Hardwoods Twenty Years After Cutting
Francis Howlett Eyre
Walter Morrison Zillgitt
出版
Lake States Forest Experiment Station, U.S. Department of Agriculture, Forest Service
, 1950
URL
http://books.google.com.hk/books?id=KTJZ0AEACAAJ&hl=&source=gbs_api